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Forward osmosis

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https://www.readbyqxmd.com/read/28803191/enhancing-recovery-of-magnesium-as-struvite-from-landfill-leachate-by-pretreatment-of-calcium-with-simultaneous-reduction-of-liquid-volume-via-forward-osmosis
#1
Simiao Wu, Shiqiang Zou, Guannan Liang, Guangren Qian, Zhen He
Landfill leachate contains substances that can be potentially recovered as valuable resources. In this study, magnesium in a landfill leachate was recovered as struvite with calcium pretreatment; meanwhile, the leachate volume was reduced by using a submerged forward osmosis (FO) process, thereby enabling significant reduction of further treatment footprint and cost. Without pretreatment, calcium exhibited strong competition for phosphate with magnesium. The pretreatment with a Ca(2+): CO3(2-) molar ratio of 1:1...
August 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28777991/microalgae-dewatering-based-on-forward-osmosis-employing-proton-exchange-membrane
#2
Jieun Son, Mina Sung, Hoyoung Ryu, You-Kwan Oh, Jong-In Han
In this study, electrically-facilitated forward osmosis (FO) employing proton exchange membrane (PEM) was established for the purpose of microalgae dewatering. An increase in water flux was observed when an external voltage was applied to the FO equipped with the PEM; as expected, the trend became more dramatic with both concentration of draw solution and applied voltage raised. With this FO used for microalgae dewatering, 247% of increase in flux and 86% in final biomass concentration were observed. In addition to the effect on flux improvement, the electrically-facilitated FO exhibited the ability to remove chlorophyll from the dewatered biomass, down to 0...
July 17, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28772356/integrating-seawater-desalination-and-wastewater-reclamation-forward-osmosis-process-using-thin-film-composite-mixed-matrix-membrane-with-functionalized-carbon-nanotube-blended-polyethersulfone-support-layer
#3
Hyeon-Gyu Choi, Moon Son, Heechul Choi
Thin-film composite mixed matrix membrane (TFC MMM) with functionalized carbon nanotube (fCNT) blended in polyethersulfone (PES) support layer was synthesized via interfacial polymerization and phase inversion. This membrane was firstly tested in lab-scale integrating seawater desalination and wastewater reclamation forward osmosis (FO) process. Water flux of TFC MMM was increased by 72% compared to that of TFC membrane due to enhanced hydrophilicity. Although TFC MMM showed lower water flux than TFC commercial membrane, enhanced reverse salt flux selectivity (RSFS) of TFC MMM was observed compared to TFC membrane (15% higher) and TFC commercial membrane (4% higher), representing membrane permselectivity...
October 2017: Chemosphere
https://www.readbyqxmd.com/read/28761159/anti-fouling-double-skinned-forward-osmosis-membrane-with-zwitterionic-brush-for-oily-wastewater-treatment
#4
Chi Siang Ong, Bader Al-Anzi, Woei Jye Lau, Pei Sean Goh, Gwo Sung Lai, Ahmad Fauzi Ismail, Yue Seong Ong
Despite its attractive features for energy saving separation, the performance of forward osmosis (FO) has been restricted by internal concentration polarization and fast fouling propensity that occur in the membrane sublayer. These problems have significantly affected the membrane performance when treating highly contaminated oily wastewater. In this study, a novel double-skinned FO membrane with excellent anti-fouling properties has been developed for emulsified oil-water treatment. The double-skinned FO membrane comprises a fully porous sublayer sandwiched between a highly dense polyamide (PA) layer for salt rejection and a fairly loose dense bottom zwitterionic layer for emulsified oil particle removal...
July 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28709179/modeling-of-nanoscale-liquid-mixture-transport-by-density-functional-hydrodynamics
#5
Oleg Yu Dinariev, Nikolay V Evseev
Modeling of multiphase compositional hydrodynamics at nanoscale is performed by means of density functional hydrodynamics (DFH). DFH is the method based on density functional theory and continuum mechanics. This method has been developed by the authors over 20 years and used for modeling in various multiphase hydrodynamic applications. In this paper, DFH was further extended to encompass phenomena inherent in liquids at nanoscale. The new DFH extension is based on the introduction of external potentials for chemical components...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28692923/permeability-recovery-of-fouled-forward-osmosis-membranes-by-chemical-cleaning-during-a-long-term-operation-of-anaerobic-osmotic-membrane-bioreactors-treating-low-strength-wastewater
#6
Xinhua Wang, Taozhan Hu, Zhiwei Wang, Xiufen Li, Yueping Ren
Anaerobic osmotic membrane bioreactor (AnOMBR) has gained increasing interests in wastewater treatment owing to its simultaneous recovery of biogas and water. However, the forward osmosis (FO) membrane fouling was severe during a long-term operation of AnOMBRs. Here, we aim to recover the permeability of fouled FO membranes by chemical cleaning. Specifically speaking, an optimal chemical cleaning procedure was searched for fouled thin film composite polyamide FO (TFC-FO) membranes in a novel microfiltration (MF) assisted AnOMBR (AnMF-OMBR)...
July 5, 2017: Water Research
https://www.readbyqxmd.com/read/28672186/effect-of-pretreatment-and-membrane-orientation-on-fluxes-for-concentration-of-whey-with-high-foulants-by-using-nh3-co2-in-forward-osmosis
#7
M Seker, E Buyuksari, S Topcu, D S Babaoglu, D Celebi, B Keskinler, C Aydiner
Usage of forward osmosis membrane in FO mode, in which active and support layers of the membrane were in contact with the feed and the draw solutions respectively, provided higher initial water flux (12L/m(2)h) than the usage of membrane in PRO mode (6L/m(2)h) having opposite orientation but fluxes approached to each other after 4h during concentration of whey with NH3/CO2 as draw salt. High organic and inorganic foulants of whey was considered as reason for observed result in addition to lower solute resistivity...
June 21, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28628880/forward-osmosis-for-oily-wastewater-reclamation-multi-charged-oxalic-acid-complexes-as-draw-solutes
#8
Qingchun Ge, Gary Lee Amy, Tai-Shung Chung
Forward osmosis (FO) has demonstrated its merits in hybrid FO seawater desalination. However, FO may have a potential for other applications if suitable draw solutes are available. In this study, a series of novel draw solutes based on oxalic acid (OA)-transitional metal complexes are presented. Influential factors of FO performance have been systematically investigated by varying the transitional metals, cations of the complex draw solutes as well as the experimental conditions. Compared to NaCl and other recently synthesized draw solutes, the OA complexes show superior FO performance in terms of high water fluxes up to 27...
June 10, 2017: Water Research
https://www.readbyqxmd.com/read/28628868/an-overview-on-exploration-and-environmental-impact-of-unconventional-gas-sources-and-treatment-options-for-produced-water
#9
REVIEW
Tânia L S Silva, Sergio Morales-Torres, Sérgio Castro-Silva, José L Figueiredo, Adrián M T Silva
Rising global energy demands associated to unbalanced allocation of water resources highlight the importance of water management solutions for the gas industry. Advanced drilling, completion and stimulation techniques for gas extraction, allow more economical access to unconventional gas reserves. This stimulated a shale gas revolution, besides tight gas and coalbed methane, also causing escalating water handling challenges in order to avoid a major impact on the environment. Hydraulic fracturing allied to horizontal drilling is gaining higher relevance in the exploration of unconventional gas reserves, but a large amount of wastewater (known as "produced water") is generated...
June 16, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28621919/insights-on-tuning-the-nanostructure-of-rgo-laminate-membranes-for-low-pressure-osmosis-process
#10
Qiuze Wang, Cyril Aubry, Yaxin Chen, Huaihe Song, Linda Zou
In this research, rGO laminates were prepared by a controlled partial reduction step, aimed to avoid aggregation and tune the interlayer spacing (d) between the rGO layers. The mild reducing agent vitamin C (l-AA) and cross-linker poly(carboxylic acid)s were used to improve the stability of the assembled rGO laminate membranes. AFM was used for the first time to further investigate the statistical size distribution of spacing between rGO layers. Topographical images of the edges of the rGO layers were obtained with an AFM instrument; interlayer spacing profiles were extracted, and then the data was plotted and fitted with Gaussian curves...
July 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28617282/hg-removal-and-the-effects-of-coexisting-metals-in-forward-osmosis-and-membrane-distillation
#11
Chia-Yu Wu, Shiao-Shing Chen, Dai-Zhou Zhang, Jun Kobayashi
In this study, we investigate the rejection of Hg, Cd, and Pb and the effect of coexisting metals on Hg removal through forward osmosis (FO) and membrane distillation (MD) in order to establish a more effective water treatment process. The results of our laboratory experiment indicate that more than 97% of the rejection for each metal is achieved through the FO system, and this rejection is the highest among previous studies using membrane filtrations. Moreover, we examine the matrix effect of the coexisting Cd and Pb on the rejection of Hg in the FO system...
June 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28604649/a-short-review-of-membrane-fouling-in-forward-osmosis-processes
#12
REVIEW
Youngpil Chun, Dennis Mulcahy, Linda Zou, In S Kim
Interest in forward osmosis (FO) research has rapidly increased in the last decade due to problems of water and energy scarcity. FO processes have been used in many applications, including wastewater reclamation, desalination, energy production, fertigation, and food and pharmaceutical processing. However, the inherent disadvantages of FO, such as lower permeate water flux compared to pressure driven membrane processes, concentration polarisation (CP), reverse salt diffusion, the energy consumption of draw solution recovery and issues of membrane fouling have restricted its industrial applications...
June 12, 2017: Membranes
https://www.readbyqxmd.com/read/28531853/methane-production-in-an-anaerobic-osmotic-membrane-bioreactor-using-forward-osmosis-effect-of-reverse-salt-flux
#13
Sheng Li, Youngjin Kim, Sherub Phuntsho, Laura Chekli, Ho Kyong Shon, TorOve Leiknes, Noreddine Ghaffour
This study investigated the impact of reverse salt flux (RSF) on microbe community and bio-methane production in a simulated fertilizer driven FO-AnMBR system using KCl, KNO3 and KH2PO4 as draw solutes. Results showed that KH2PO4 exhibited the lowest RSF in terms of molar concentration 19.1mM/(m(2).h), while for KCl and KNO3 it was 32.2 and 120.8mM/(m(2).h), respectively. Interestingly, bio-methane production displayed an opposite order with KH2PO4, followed by KCl and KNO3. Pyrosequencing results revealed the presence of different bacterial communities among the tested fertilizers...
September 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28528503/a-flux-enhancing-forward-osmosis-nanofiltration-integrated-treatment-system-for-the-tannery-wastewater-reclamation
#14
Parimal Pal, Sankha Chakrabortty, Jayato Nayak, Suman Senapati
Effective treatment of tannery wastewater prior to discharge to the environment as per environmental regulations remains a big challenge despite efforts to bring down the concentrations of the pollutants which are often quite high as measured in terms of chemical oxygen demand (7800 mg/L), total dissolved solids (5400 mg/L), chloride (4260 mg/L), sulphides (250 mg/L) and chromium. A pilot-scale forward osmosis and nanofiltration integrated closed loop system was developed for continuous reclamation of clean water from tannery wastewater at a rate of 52-55 L/m(2)/h at 1...
May 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28527139/exploration-of-an-innovative-draw-solution-for-a-forward-osmosis-membrane-distillation-desalination-process
#15
Nguyen Cong Nguyen, Shiao-Shing Chen, Shubham Jain, Hau Thi Nguyen, Saikat Sinha Ray, Huu Hao Ngo, Wenshan Guo, Ngoc Tuan Lam, Hung Cong Duong
Forward osmosis (FO) has emerged as a viable technology to alleviate the global water crisis. The greatest challenge facing the application of FO technology is the lack of an ideal draw solution with high water flux and low reverse salt flux. Hence, the objective of this study was to enhance FO by lowering reverse salt flux and maintaining high water flux; the method involved adding small concentrations of Al2(SO4)3 to a MgCl2 draw solution. Results showed that 0.5 M MgCl2 mixed with 0.05 M of Al2(SO4)3 at pH 6...
May 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28414439/mitigation-of-thin-film-composite-membrane-biofouling-via-immobilizing-nano-sized-biocidal-reservoirs-in-the-membrane-active-layer
#16
Alireza Zirehpour, Ahmad Rahimpour, Ahmad Arabi Shamsabadi, Mohammad Sharifian Gh, Masoud Soroush
This work investigates the use of a silver-based metal-organic framework (MOF) for mitigating biofouling in forward-osmosis thin-film composite (TFC) membranes. This is the first study of the use of MOFs for biofouling control in membranes. MOF nanocrystals were immobilized in the active layer of the membranes via dispersion in the organic solution used for interfacial polymerization. Field emission scanning electron microscopy (FE-SEM) and X-ray photoelectron spectroscopy (XPS) characterization results showed the presence of the MOF nanocrystals in the active layer of the membranes...
April 27, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28412549/enhancing-boron-rejection-in-fo-using-alkaline-draw-solutions
#17
Yi-Ning Wang, Weiyi Li, Rong Wang, Chuyang Y Tang
This study provides a novel method to enhance boron removal in a forward osmosis (FO) process. It utilizes the reverse solute diffusion (RSD) of ions from alkaline draw solutions (DSs) and the concentration polarization of the hydroxyl ions to create a highly alkaline environment near the membrane active surface. The results show that boron rejection can be significantly enhanced by increasing the pH of NaCl DS to 12.5 in the active-layer-facing-feed-solution (AL-FS) orientation. The effect of RSD enhanced boron rejection was further promoted in the presence of concentration polarization (e...
July 1, 2017: Water Research
https://www.readbyqxmd.com/read/28388525/development-of-combined-nanofiltration-and-forward-osmosis-process-for-production-of-ethanol-from-pretreated-rice-straw
#18
Masafumi Shibuya, Kengo Sasaki, Yasuhiro Tanaka, Masahiro Yasukawa, Tomoki Takahashi, Akihiko Kondo, Hideto Matsuyama
A membrane process combining nanofiltraion (NF) and forward osmosis (FO) was developed for the sugar concentration with the aim of high bio-ethanol production from the liquid fraction of rice straw. The commercial NF membrane, ESNA3, was more adequate for removal of fermentation inhibitors (such as acetic acid) than the FO membrane, whereas the commercial FO membrane, TFC-ES, was more adequate for concentration of the sugars than the NF membrane. The liquid fraction was subjected to the following process: NF concentration with water addition (NF(+H2O))→enzymatic hydrolysis→FO concentration...
July 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28380231/forward-osmosis-in-wastewater-treatment-processes
#19
Jasmina Korenak, Subhankar Basu, Malini Balakrishnan, Claus Hélix-Nielsen, Irena Petrinic
In recent years, membrane technology has been widely used in wastewater treatment and water purification. Membrane technology is simple to operate and produces very high quality water for human consumption and industrial purposes. One of the promising technologies for water and wastewater treatment is the application of forward osmosis. Essentially, forward osmosis is a process in which water is driven through a semipermeable membrane from a feed solution to a draw solution due to the osmotic pressure gradient across the membrane...
2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28342589/energy-consumption-by-forward-osmosis-treatment-of-landfill-leachate-for-water-recovery
#20
Syeed Md Iskander, Shiqiang Zou, Brian Brazil, John T Novak, Zhen He
Forward osmosis (FO) is an alternative approach for treating landfill leachate with potential advantages of reducing leachate volume and recovering high quality water for direct discharge or reuse. However, energy consumption by FO treatment of leachate has not been examined before. Herein, the operational factors such as recirculation rates and draw concentrations were studied for their effects on the quantified energy consumption by an FO system treating actual leachate collected from two different landfills...
May 2017: Waste Management
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